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22LK336C (CHASSIS:LD0EB) - LG TV Service Manual (repair manual). Page 17

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Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703.
Check Tuner 1.8V Power 
IC3703  2 pin : 1.8V
Check  IF_P/N Signal
TU3700 10/11  Pin
Replace IC3703. 
Check Mstar LVDS Output.
Replace Mstar(IC101) o r Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
Check RF Cable & Signal.
Check Tuner 3.3V Power.
L3703
Replace L3703.
Check Tuner 1.8V Power.
IC3703 2 pin : 1.8V
Check  CVBS Signal.
TU3700 8 Pin
Replace IC3703.
Check Mstar LVDS Output.
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
2. Digital TV Video
3. Analog TV Video
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